Add a "fork" of musl as //fusl.

fusl/src/linux/clone.c

Index: fusl/src/linux/clone.c
diff --git a/fusl/src/linux/clone.c b/fusl/src/linux/clone.c
new file mode 100644
index 0000000000000000000000000000000000000000..b9e5594530474c069a8559c009d2d5f5086b8908
--- /dev/null
+++ b/fusl/src/linux/clone.c
@@ -0,0 +1,19 @@
+#include <stdarg.h>
+#include <unistd.h>
+#include "pthread_impl.h"
+#include "syscall.h"
+
+int clone(int (*func)(void *), void *stack, int flags, void *arg, ...)
+{
+	va_list ap;
+	pid_t *ptid, *ctid;
+	void  *tls;
+
+	va_start(ap, arg);
+	ptid = va_arg(ap, pid_t *);
+	tls  = va_arg(ap, void *);
+	ctid = va_arg(ap, pid_t *);
+	va_end(ap);
+
+	return __syscall_ret(__clone(func, stack, flags, arg, ptid, tls, ctid));
+}